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Finding the Fourth Proportional to 1,266.28, 1,899.78 and 919.96

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Solution

The fourth proportional to 1,266.28, 1,899.78 and 919.96 is: 1,380.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.28 : 1,899.78 = 919.96 : x
  2. Step 2: Convert to fraction form
    1,266.28/1,899.78 = 919.96/x
  3. Step 3: Cross multiply
    1,266.28x = 1,899.78 × 919.96
  4. Step 4: Simplify right side
    1,266.28x = 1,747,721.61
  5. Step 5: Solve for x
    x = 1,747,721.61/1,266.28
  6. Step 6: Final answer
    x = 1,380.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.